Online Calculators & Tools
Free calculators, converters, and tools for math, finance, health, web development, and everyday tasks. Fast, accurate, and mobile-friendly.
Categories
Math
Percentage, average, ratio, standard deviation, fraction, area, and scientific calculators.
9 toolsFinance
Mortgage, loan, interest, retirement, savings, tip, sales tax, and percentage change calculators.
23 toolsHealth
BMI, age, calorie, and ideal weight calculators.
10 toolsWeb Development
HTML escape, URL encode, Base64, JSON formatter, and word counter.
8 toolsConverters
Length, weight, temperature, speed, time, volume, and data storage unit converters.
9 toolsEveryday
Password generator, random number, dice roller, coin flip, date calculator, date diff, and number to words.
20 toolsPopular Tools
Grade Calculator
Calculate weighted grades, final exam scores needed, and overall course averages.
EverydayGPA Calculator
Calculate your GPA on a 4.0 scale, 5.0 scale, or custom scale. Supports weighted and unweighted.
EverydayHourly to Salary Calculator
Convert hourly wage to annual, monthly, and weekly salary. Includes overtime and part-time options.
FinanceSalary to Hourly Calculator
Convert annual salary to hourly wage. See how much you earn per hour, week, and month.
FinanceHours Calculator
Calculate hours and minutes between two times. Perfect for work shifts, timesheets, and time tracking.
EverydayPaycheck Calculator
Calculate net pay, gross pay, and deductions. Estimate your take-home pay after taxes.
FinanceInflation Calculator
Calculate inflation-adjusted value, purchasing power, and average inflation rate between years.
FinancePercentage Calculator
Calculate percentages, find what percent a number is of another, and percentage change.
MathFraction Calculator
Add, subtract, multiply, divide, and simplify fractions with step-by-step results.
MathBMI Calculator
Calculate Body Mass Index with metric or imperial units and health categories.
HealthLoan Calculator
Calculate monthly payments, total interest, and amortization schedule.
FinanceTip Calculator
Calculate tip amount and split bills easily between multiple people.
FinanceJust Added
Sleep Calculator NEW
Find the best time to sleep or wake up based on 90-minute sleep cycles. Wake up refreshed, not groggy.
HealthAttendance Calculator NEW
Calculate your attendance percentage, classes needed to reach 75%, and how many classes you can safely skip.
EverydayMarks Percentage Calculator NEW
Calculate your overall percentage from marks in multiple subjects. Add subjects, get percentage and grade instantly.
EverydayBMR Calculator NEW
Calculate your Basal Metabolic Rate using the Mifflin-St Jeor equation. Know exactly how many calories you burn at rest.
HealthTDEE Calculator NEW
Calculate Total Daily Energy Expenditure with activity level and goal-based calories for cutting, maintenance, or bulking.
HealthBody Fat Calculator NEW
Estimate your body fat percentage using the US Navy method with height, neck, waist, and hip measurements.
HealthConcrete Calculator NEW
Calculate cubic yards of concrete needed for slabs, footings, and driveways, plus how many bags to buy.
EverydaySimple Interest Calculator NEW
Calculate simple interest and total amount on any principal, rate, and time period. Includes yearly breakdown.
FinanceFD Calculator NEW
Calculate fixed deposit maturity amount and interest earned with quarterly compounding across all tenures.
FinanceCAGR Calculator NEW
Calculate Compound Annual Growth Rate of any investment. See annualized returns and total growth instantly.
FinanceAll Calculators
💰 Finance
🛠️ Everyday
Why Use Our Calculators?
Instant Results
All calculations run directly in your browser. No server delays, no page reloads.
Mobile Friendly
Every tool is optimized for phones, tablets, and desktops with responsive design.
Private & Secure
Your data never leaves your device. No tracking, no cookies, no data collection.
Educational
Learn the formulas, see examples, and understand how each calculation works.
SEO Optimized
Every page includes structured data, Open Graph tags, and XML sitemap support.
100% Free
No registration required. No ads. Just fast, free tools that work every time.
Frequently Asked Questions
Are all calculators free to use?
Yes, every calculator on SumItUp is completely free. No registration, no ads, no hidden fees.
Do the calculators work on mobile phones?
Absolutely. All tools are built with a mobile-first responsive design and work perfectly on any device.
Is my data safe when using these tools?
Yes. All calculations happen inside your browser. We never send your data to any server.
Can I use these calculators offline?
Once a page is loaded, most calculators work without an internet connection.
How accurate are the results?
Our calculators use standard mathematical formulas and provide results accurate to multiple decimal places.